Plus is Wayne Dalton's exclusive counterbalance system that
safely and cleanly contains the springs inside a steel tube.
Having the springs contained in the metal tube looks much better
than exposed springs and prevents the collection of dirt and
grime on them.
The TorqueMaster® Plus design helps prevent injury
that could result from the accidental release of tension and
includes an anti-drop safety device. If a spring should happen
to break while the door is in the up position, the anti-drop
device will stop the door from going into a free fall.